Dustin Moskovitz

A Facebook co-founder, Moskovitz was Zuckerberg's roommate at Harvard, then dropped out and moved to Palo Alto, CA, with him to work full time on the social network. As the company's first chief technology officer, and later vice president of engineering, Moskovitz was in charge of the site's architecture as well as the company's mobile strategy. He left Facebook in October 2008 to form Asana, a Web-based collaboration tool. In 2011, Moskovitz created the philanthropic foundation Good Ventures.

Relationship to Facebook

Talk about the luck of the draw when it comes to roommate assignments! Already recognized as the world's youngest self-made billionaire, Zuckerberg's former roommate holds a 7.5 percent stake in Facebook—or as much as $4.7 billion after the IPO. And he hasn't worked for the company in three and a half years.